#include<bits/stdc++.h>
using namespace std;
int n;
int t;
int a[1000005];
int main()
{
    freopen("color.in","r",stdin);
    freopen("color.out","w",stdout);
    cin>>t;
    for(int i = 1;i<=t;i++)
    {
        cin>>n;
        for(int j = 1;j<+n;j++)
        {
            cin>>a[i];
        }
        cout<<"0"<<endl;
    }
    return 0;
}